Abstract:
A dry FCVS for a nuclear reactor containment is provided. The dry FCVS includes a housing and a round and/or elongated aerosol filter inside the housing for removing contaminant aerosols from gas passing through the housing during venting of the containment. The housing includes at least one inlet portion configured for directing gas into the aerosol filter during the venting of the containment and an outlet portion for gas filtered by the aerosol filter during the venting of the containment. The dry filtered containment venting system is arranged and configured such that when a flow of gas through the outlet portion is closed off at least one of convective, radiant and conductive heat transfer removes decay heat of aerosols captured in the aerosol filter.
Abstract:
A method and apparatus are disclosed for determining fluid flow in a flow path of a vortex amplifier (10). The method comprises the steps of preventing flow of control fluid in a direction substantially opposite to a primary direction of purge fluid flow in a purge flow path of a vortex amplifer.
Abstract:
A vent tube (66) and housing nut (62) replace the original housing plug (52) on a pressurized water nuclear reactor. The vent tube engages the installed vent stem (38) cross-slot (48) with a cross-shaped projection (70). During operation, the vent tube (66) is pushed down to engage the vent stem (38) and rotated to allow vented air to travel through stem (38) and tube (66). After venting, the vent stem is rotated back and tightened. The invention provides visual indication of a leaking ball (32) since any leakage lifts vent tube (66). Time required for venting is reduced and no removal of installed ball seal (32, 34), a proven primary seal, is required.
Abstract:
Ein Containment-Schutzsystem (2) zur Behandlung der im Containment (4) einer kerntechnischen Anlage (6), insbesondere eines Kernkraftwerks, befindlichen Atmosphäre bei kritischen Störfällen mit massiver Freisetzung von Wasserstoff (H 2 ) und Dampf soll dazu in der Lage sein, derartige Zustände auf überwiegend passive Weise und möglichst ohne Belastung der Umgebung effektiv und schnell abzubauen. Zu diesem Zweck weist das Containment-Schutzsystem (2) erfindungsgemäß einen ein Leitungssystem (10, 72, 120, 128) umfassenden, zum Anschluss an das Containment (4) vorgesehenen Kreislauf aus dem Containment (4) und wieder zurück für einen Fluidstrom auf, und zwar mit zumindest folgenden strömungsmäßig in Reihe geschalteten Komponenten: eine Rekombinationsvorrichtung (20) zur Rekombination von im Fluidstrom enthaltenem Wasserstoff (H 2 ) mit Sauerstoff (O 2 ) zu Wasserdampf (H 2 O); eine der Rekombinationsvorrichtung (20) nachgeschaltete Kondensationsvorrichtung (74) zur Kondensation von im Fluidstrom enthaltenen Dampfanteilen mit Mitteln zur Ableitung des Kondensats (94) aus dem Fluidstrom; Antriebsmittel (18, 180) für den Fluidstrom, wobei für eine zumindest teilweise Rückkühlung der Kondensationsvorrichtung (74) ein Wärmetauscher (96) vorhanden ist, der eingangsseitig über eine Zufuhrleitung (144) mit einem Vorratsbehälter (140) für flüssigen Stickstoff (N 2 ) verbunden ist.
Abstract:
A power module assembly includes a reactor core immersed in a coolant and a reactor vessel housing the coolant and the reactor core. An internal dry containment vessel submerged in liquid substantially surrounds the reactor vessel in a gaseous environment. During an over-pressurization event the reactor vessel is configured to release the coolant into the containment vessel and remove a decay heat of the reactor core through condensation of the coolant on an inner surface of the containment vessel.
Abstract:
Procédé de remplissage en eau et de vidange en air d'un circuit primaire principal (1) d'une tranche nucléaire suite à son arrêt, ledit circuit primaire principal (1) comprenant une cuve (2) située dans une piscine d'un bâtiment réacteur (4), des pompes primaires (5), au moins un générateur de vapeur (6) comprenant une pluralité de tubes de générateurs de vapeur (7) situés au-dessus du niveau de la cuve (2), et un pressuriseur (8).
Abstract:
The invention relates to a method which comprises filling the primary circuit (1) with water and setting the water pressure in said primary circuit (1) at a level allowing the operation of the primary pumps (15, 25, 35), operating the first primary pump (35) of a loop (33) which is not connected to the pressurizer (17) by a pressurization line (18), continuously exhausting the gas contained in the primary circuit (1) and carried by the water circulated by the pump (35) in the upper part of the vessel (12) at least during the primary pump operation, stopping the first primary pump (35) and successively operating the other primary pumps (25, 15) and, simultaneously, all the primary pumps (15, 25, 35) by simultaneously exhausting the gas in the upper part of said vessel (12) and carrying out the final venting of the primary circuit at the uppermost points of said primary circuit (1), by means of first and second exhaust lines (27, 22), respectively connected to the cover of the vessel (12) and to the pressurizer (17). Said invention also relates to a device comprising means for continuously exhausting gas reaching the upper part (12a) of the vessel (12) during the operation of the pumps.
Abstract:
A system for draining a containment vessel may include a drain inlet located in a lower portion of the containment vessel. The containment vessel may be at least partially filled with a liquid, and the drain inlet may be located below a surface of the liquid. The system may further comprise an inlet located in an upper portion of the containment vessel. The inlet may be configured to insert pressurized gas into the containment vessel to form a pressurized region above the surface of the liquid, and the pressurized region may operate to apply a surface pressure that forces the liquid into the drain inlet. Additionally, a fluid separation device may be operatively connected to the drain inlet. The fluid separation device may be configured to separate the liquid from the pressurized gas that enters the drain inlet after the surface of the liquid falls below the drain inlet.
Abstract:
An enhanced passive containment air cooling system for a nuclear power plant that increases the heat transfer surface on the exterior of the nuclear plant's containment vessel. The increased surface area is created by forming a tortuous path in or on at least a substantial part of the exterior surface of the containment vessel over which a cooling fluid can flow and follow the tortuous path. The tortuous path is formed from a series of indentations and protrusions in or on the exterior surface that form a circuitous path for the cooling fluid.
Abstract:
The invention relates to a method for the water filling and air blow-off of a main primary circuit (1) of a nuclear unit after stopping the same, said main primary circuit (1) including a tank (2) located in a pool of a reactor building (4), primary pumps (5), at least one steam generator (6) including a plurality of steam generating tubes (7) located above the level of the tank (2), and a pressuriser (8).